Denkmeier - Deep Sky Binoviewer:

Denkmeier Optical, Inc. is a company owned and operated by Russ Lederman. Let us be your source for the finest Binoviewers, Eyepieces, and Star Diagonals available anywhere. Whether your telescope is an SCT, Newtonian Reflector, Refractor, Maksutov Cassegrain, Dobsonian, Classical Cassegrain, RCX or other RC telescope brand, we have a binocular viewer for you! See our FAQ section for answers to common questions. You may see copies of our products elsewhere but do not be misled: Each and every Denk undergoes personal hands-on quality control procedures by Denk's owner throughout the production process. In fact, every Binoviewer and Eyepiece Pair has a dated certificate signed by Russ Lederman to prove it!

"Let Two Eyes Add A New Dimension To Your Observations Of The Night Sky and You Will Never Look Back" -Russ Lederman, Owner of Denkmeier Optical, Inc.

A Note To Visitors: There is a lot of information about our Binoviewer systems that can be accessed on this website. Deciding which Denk Binoviewer System is the perfect one for you, especially if you own more than one telescope can be a bit confusing. So, we suggest that you first use the Shopping Guide and choose the type of scope that you will be using from the telescope list provided. Get a bit of background information. You may feel like you now have enough information to make an informed choice. However, we are here to answer all of your questions so that you can be sure that you have selected the correct product that best matches one or all of your telescopes. We encourage and welcome you to call us (Contact) with any questions that remain after exploring this website, even if this is just to confirm that you have chosen wisely. We receive calls from all over the world everyday and are happy to help you in the selection process. We know that those of you who are pursuing an understanding and appreciation of the heavens through visual observation expect nothing less than outstanding and trouble-free performance when adding a Denk. Whether you are are just beginning, or a seasoned veteran, we are always willing to spend as much time as necessary to help you take in the wonder that is The Cosmos, "The Denk Way".

USA-Made Prisms Featuring 100% Dielectric Coatings Shipped World Wide to 35+ Countries and Counting!! Add our Matched D21mm and D14mm 65 degree eyepieces. They are guaranteed to render amazing performance in your Denk. We assemble them right here in the USA.

"The Vast and Mysterious Universe Deserves to Be Viewed With Nothing Less Than a Denk!" - Anonymous

OK.... I admit it. I said it. But it's true!!! -Russ

We Accept Credit Card Payment From Our Amateur Astronomy Friends From All Over The World! We Provide Systems To Customers In Over 35 Countries On Our Planet Earth!!

6% Maryland Sales Tax will be added to all retail prices for Maryland, USA residents.

Focal Reduction With a Denk Binoviewer In A Dob??

Yes!! A New $199 Option for Denk II Newtonian and Universal Power x Switch Systems
Everyone with a big dob seems to want a "lowest Power Option" for wider fields of view. Our new .85X Power x Switch Reducer System for Newtonians delivers "Unit 1X Magnification" when used with The 1.4X Denk II Newtonian Power x Switch System, and ".85X Reduction Magnification" when used with The Denk II Universal Power x Switch System. Specially designed to work with our D21 Eyepieces, this system will allow them to operate as if they were 24mm 65 degree eyepieces with this very new Denkmeier System.

Any Denkmeier Binoviewer using our 2" OCS and Power Switch System may easily upgrade and add this auxillary Reduction Power x Switch. Reduction can be implemented instantly, and then removed instantly. Only Denkmeier Optical offers a true Power Switching 2" Optical Corrector System and now the "Reduction-Mode" makes wider field views of nebulae and galaxies possible. Designed by Russ Lederman, Owner of Denkmeier Optical and long-time 20" F/5 user, you asked for it and we heard you! Information will be added to the website on a special page very soon featuring photos and descriptions as well as focuser requirements. Call for details or note "Add Reduction Power Switch" in the comment box on your shopping cart order. We will add a charge of $199 to the order.

Complete operating manual HERE (PDF)

I did have a chance to try the unit out in my LX90 last night. Simply Amazing! I don't think I can ever go back to monocular viewing! And the binoviewer itself is a work of art. I am extremely impressed. I had my best look yet at Comet Holmes in reduction mode of the Power x Switch.-R. Harris 11-15-07

The New, Protective Filter Switch....Click Here!!
The Filter Switch is Reviewed on Cloudy Nights.... Click Here
Filter, UHC, Deepsky Filter

Instant Switching Between Filters!
Now reviewed in Astronomy Technology Today
October, 2007 Issue

What is it that will allow you to see The Horsehead Nebula visually, in real time , with an 80mm refractor under average skies? Did we mention you'll be using both eyes and immerse yourself in a 65 degree apparent field of view? It's coming soon, and it is only for Denk Binoviewers, and only available in The United States of America. As with all new Denk innovations, pre-orders will be accepted only after we allow our fussy Beta-Testers and Reviewers to observe with, and then comment on this revolutionary new system. Patent-Pending

This personal quest has finally come together with the synergy that has emerged after meeting with some new collaborators! Stay tuned." -Russ Lederman

Delivery Schedules
January 1st, 2008- Normally, products ship within a few days of placing your on-line order. Every Denk Binoviewer System and D21 or D14 eyepiece pair is carefully assembled in our Ocean City Maryland Shop and generally, we build each system after an order has been placed by a customer, for that specific individual. Every binoviewer and eyepiece pair that leaves the Denkmeier Shop is accompanied by a certificate signed by Russ Lederman, Owner of Denkmeier Optical, Inc. stating that he has personally assembled and tested your Binoviewer & Eyepieces. All OCS Lenses are tested using extra-focal diffraction patterns viewed through a flourite objective lens. Basically, personal attention to important details is our philosophy.

If there is a need to receive an order within one or two days after an order has been placed, please email us to let us know and we will confirm the availability of that particular product.

The latest Denk II Glass has some new and beneficial features!* We will not outsource the extremely important job involved in examining each optical surface on every prism under magnification, and then setting the prisms and building each system as a unique and cutting edge optical instrument. This practice increases production time, but ensures that each Denk Binoviewer System and Denk D21 or D14 eyepiece pair has been made with our careful attention to quality control as a "built-in ingredient".

*Improved Scratch/Dig Specifications of 40/20 For EVERY Surface, New Special Baffling Design For Superior Elimination of Out-Of-Field Reflections, & New Shape of The Glass Prisms For Ideal Fit. Our new and improved Beam Splitter coating is 100% Dielectric!